Micrometer adjusting means for pump strokes



Aug. 21, 1951 SETER 2,564,793

MICROMETER ADJUSTING MEANS FOR PUMP STROKES Filed Nov. 1, 1946 2 Sheets-Sheet l HIV/4 m I v Q n I I a y z I m. H I I w [I W a; 'I' lo h m 3|.

I I O \9 I 4 -51 g on I I 5 v II I L JNVENTOR. PTR K. 6522? ATTORNEY Aug. 21, 1951 P. K. SETER MICROMETER ADJUSTING MEANS FOR PUMP STROKES ts-Sheet 2 2 Shee Filed Nov. 1, 1946 INVENTOR. 1 :75? K. 6475/? B M E52 EELI PM faientecl Aug. 2 1, 1 95i g r DIICROMETER ADJUSTING MEANS FOR PUlVIP STROKES Peter K. Seter, Milwaukee, Wis. Application November 1, 1946, SerialNo. 707,179

This invention relates to improvements in pump stroke adjusting and cushioning means for use in connection with feed water pumps.

Generally the invention comprehends the use of a. vernier adjustment of the plunger rod stroke through the medium of a lever and bumper arm, the lever being variable by means of a microadjustment, and the bumper arm providing a cushion-ing means for the pump plunger.

Heretofore it has been customary in many instances to feed chemicals and like materials by a reciprocating pump which is designed to introduce a shot of chemical at one time, this shot of chemical being more or less constant and consequently the possibility of over-feeding or underfeeding essentially creates an undesirable situation. A further method of providing chemicals and the like included the use of an electrically driven chemical pump, which pump would operate intermittently for a predetermined period out of each hour, regardless of the requirements at the time of the chemical feeding. Obviously this method lacked the accuracy essential to proper feeding in proportion to the predetermined requirement.

This application relates to improvements in pump stroke adjustment for chemical pumps. Generally the invention comprehends the use of Vernier adjustment of the plunger rod stroke so that the pump stroke can be adjusted and read in increments of .001 per inch, or in percentage from to 100% of pump capacity, this being done while the pump is in operation. This is very important in a continual chemical process, as it is not necessary to shut down a pump to adjust it. The change in stroke can be made any time. The stroke changes can be made accurately and rapidly without any trouble.

I The present invention comprehends the use of a micromechanism by means of which the supply of chemical to the boiler can be adjusted accurately and minutely by a microreading so that the proper balance will be available at all times.

Reference will be head to the accompanying drawings forming a part of this specification and wherein like characters of reference designate a corresponding part throughout the several views, in which;

Figure 1 is a side elevation of the apparatus with the housing shown in section.

- Figure 2 is a top plan view of the apparatus.

Figure 3 is a horizontally sectional View of the apparatus on line 33 of Figure l, and

Figure 4 is a transverse section on line 4-4.

;In the present illustration of the development 7 Claims. (Cl. 103-33) a rectangular housing is shown and includes the side walls I and 2, end walls 3 and 3, bottom 4 and top 4. One of the side walls is formed with an enlarged opening 5 covered by a wall plate 6, which latter is secured by means of bolts 1 to the adjacent wall structure I. A packing element 8 is shown interposed between the side plate 6 of the wall I to provide a seal to prevent the leakage of oil from the casing. An opening 9 is formed in the end walls 3 and secured to this wall 3 about the opening 9, is the pump housing [0, .the latter being formed with off-set flanges H (Figure 1) through which bolts 12 extend for securing the pump housing to the adjacent casing wall. As is customary in such pump structures the pump cylinder l4 extends from and forms a part of the housing assembly, this pump cylinder being provided with a bore [5 in which the pump piston l6 reciprocates. Inlet and outlet ports are provided for the pump cylinder, these ports being in communication with transverse bore 16' at the end of the pump cylinder. A suitbale check inlet valve I! is connected at one end of the bore I6 while an outlet check valve [8 is threaded into the other end of the bore l6. Pipe connections I9 and 20 respectively are associated with the pump inlets and outlets through the check valves as is conventional in arrangements of this type. Referring to Figure 3, it will be seen that a packing gland 2| is provided for the piston I6, this packing gland being threaded into the enlarged bore 22 forming a continuation of the inner end of th pump chamber and being associated with a suitable packing not illustrated. The pump cylinder l4 may be formed as an integral part of the pump housing or may be formed as a separate element and secured in the annular socket 23 by any suitable means.

Pump rod or plunger l6 which operates in the pump cylinder 15 is connected to the push rod 25 by the oppositely threaded connection 26, the latter being rotatable to shift the push rod and pump plunger relative to each other to provide th original pump stroke adjustment. The push rod 25 extends through the opening 9 in the end wall 3' of the housing and operates in a bearing 26", this bearing being sufliciently elongated to provide the necessary bearing surface and functioning at its outer periphery 26' to support and guide the spring 21. The spring 21 normally urges the push rod 25 outwardly to shift the pump plunger I6 in a direction to charge the pump cylinder [5. The outer end of the spring 21 abuts against the inner face of the end stop 28, the latter having the rather fiat outer tapered cone surface 29 which engages the shoe or slide 30 as more clearly shown in Figure 1 and for the purpose more clearly hereinafter described.

A pair of spaced bearing supports 3| and 32, the latter being carried by the removable plate 6, are provided at the opposite side walls for supporting the bearings 33 in which the ends of the shaft 34 are mounted. The shaft 34 supports the worm gear 35 which is suitably keyed thereto, and the cam 35, likewise keyed to the shaft. Extending lengthwise through the casing and supported in the end bearing supports 31 are the bearings 38 in which is mounted the shaft 39 to which is keyed the high speed worm gear 40 the latter meshing with the worm gear 35. The shaft 39 is driven from a suitable source of power, through the V-belt 4| and pulley 42, the latter being fixed to the shaft and positioned outwardly of the casing. The oil seal and shaft housing 43 is afiixed to the outer face of the end wall and assists in supporting the assembly against dis.- tortion due to the application of power from the source indicated.

The end wall 3 which supports the pump rod and plunger is formed with an opening 44 through which extends and is threaded a tubular micrometer support 45. The micrometer support 45 fixedly carries the micrometer housing 46 having spaced threaded guideway 41 through which the micrometer screw 48 extends. The end of the micrometer screw 48 has fixed thereto a graduated hand wheel or thumb screw 39, the graduations on which are associated with the graduations on the inclined face of the casing 45 as shown at 50 in Figure l. A hexagonal packing nut afiixed to the inner end of the guideway 45 forms an abutment for one end of the coil spring 52 mounted on the micrometer shaft. This spring 52 abuts at its other end against a nut 53 which forms an inner stop for the micrometer lever arm 54. The lever arm 54 is clamped on the micrometer shaft by the outer nut 55. The micrometer lever arm is bent medially and inwardly as best shown in Figure 1, and is provided with a projecting pin 56 which extends from the end portion of the lever arm in a plane parallel to the axis of the plane of the shaft 34.

It will be seen from the foregoing that adjustment of the micrometer will shift the position of the pin 56 and this pin 56 forms an adjustable guide over which the adjustable shoe or slide 30 travels during operation of the pump. The adjustable shoe or "slide 30 is pivotally mounted on a removable bearing supported from the fixed tubular bracket 57. The bracket 57 as shown in Figure 4 is fixed to the inner face of one of the side walls 2 and projects inwardly sufficiently to mount the shoe30 in a position directly overlying the cam drive 35 so that the shoe 30 will be properly and medially engaged by the cam to prevent distortion in delivering the stroke of the cam to the plunger 25. The position of the support 51 is likewise so associated with the cam 36 and a conical plunger head 29 that the shoe 30 will lie in the plane of the conical face of the plunger extremity.

From the foregoing it will be obvious to one skilled in the art that I have provided a pump in which there is provided an adjustable stroke to compensate for the variations in chemicals according to the boiler load, the pump having a stroke which can be adjusted through the medium of a vernier adjustment to increase or decrease by the thousandths of an inch the precise setting for the requirement of chemicals. The graduation of the vernier or micrometer shaft can 4 be arranged so that pump capacity may be adjusted from zero delivery to delivery. Heretofore in the feeding of chemicals to boils in many instances, where the reciprocating pumping or shot method was used, too much chemical was often fed to the boiler at one time, with the result of a considerable amount of carry-over. This was due to the fact that the proportion of soft water immediately after feeding time presented a problem which could not be compensated for by the mechanism available. To obtain the desired results it is necessary to feed chemical to boiler water precisely and without any guess work, so that at all times there would be a proper balance of chemical, thus eliminating the carryover. In addition to the foregoing the present mechanism provides not only exact adjustment of the chemical for the feed water but the mechanism is so constructed and arranged that the pump plunger is cushioned as well as adjusted.

It will be obvious that the present mechanism is suitable for adaptation for use in diaphragm pumps as well as in connection with the type pump illustrated in the submitted drawings.

While the present embodiment is for illustrative purposes, and the description pertains generally to the feeding of chemicals, and more specifically chemical feeding for boilers, nevertheless it will be obvious that the invention itself is suitable for use in many arts where accurate and definite feeding is essential from 0 to 100% of pump capacity as determined by the vernier adjustment in increments of .001" per inch.

What I claim is:

1. In a pump assembly, a pump chamber including inlet and outlet openings, a pumpingmember associated with said chamber, means for actuating said pumping member including a push rod and a driven cam, and means for varying the stroke of said pumping member by said cam including a fixed pivot, a swinging member interposed between the cam and the push rod and mounted at one end portion on said pivot, an axially adjustable shaft, vernier means for determining the adjustment of said shaft, and a rigid connection extending from said shaft and slidably engaging said swinging member during vernier adjustment to move the latter on its pivot against said push rod, whereby said push rod is limited in its movement towards said cam.

2. In a pump assembly, a pump chamber including inlet and outlet openings, a supporting frame for said pump chamber, a pumping member, means for actuating said pumping member including a driven cam and a push rod operated by said cam, a housing for the actuating means, a resilient plate member pivoted to the housing and interposed between said cam and said push rod, and means for adjusting said pivoted member for varying the stroke of said push rod, said means including an actuator mounted on said housing and adjustable in a plane parallel to the axis of the push rod, a slidable connection between said pivoted member and said actuator during vernier adjustment, and means for determining the amount of movement of the ac tuating member and adjustment of the pump stroke.

3. In a pump assembly, a pump chamber in cluding inlet and outlet openings, a supporting frame for said pump chamber, a pumping member, means for actuating said pumping member including a driven cam and a push rod operated by said cam, the end of said push rod adjacent said cam being formed with a conical surface, a,

housing for the actuating means, a member pivoted to said housing and interposed between the conical end of said push rod and said cam, said pivoted member lying in full stroke position in the plane of the conical face of said push rod, and means for angularly adjusting said pivoted member to a predetermined position with respect to the conical face of the end of the push rod, said means including a micrometer shaft arranged parallel to the push rod and supported by said housing, and a, connection between said micrometer shaft and said pivoted member.

4. In a pump assembly, a pump chamber including inlet and outlet openings, a pumping member associated with said chamber, means for actuating said pumping member including a driven cam and a push rod operated by said cam, a housing, a member pivoted to said housing and interposed between said cam and said push rod, said member extending to each side of said cam and being sufiiciently resilient to absorb the shock of impact upon the initial movement of the cam, and means for adjusting said pivoted member for varying the stroke of said push rod, said means including a micrometer shaft supported by said housing, and a connection between said shaft and said pivoted member slidably engaging the latter.

5. In a pump assembly, a pump chamber including inlet and outlet openings, a piston in said pump, a push rod connected to said piston, said push rod having a conical extremity, actuating means for said push rod including a cam mounted on a rotatable cam shaft, a drive shaft, driving means between said drive shaft and said cam shaft, a housing, said housing supporting said cam shaft and drive shaft, a plate pivoted to said housing and interposed between said cam and the conical end of said push rod, and means for adjusting said plate for varying the stroke of said push rod, said means including a tubular casing fixed to said housing, a micrometer shaft extending through said casing, and an angular connecting member having one end detachably connected to the micrometer shaft and its other end slidably associated with said pivoted plate.

6. In a pump assembly, a pump chamber including inlet and outlet openings and inlet and outlet valves controlling said openings, a pumping member constructed and arranged to operate in said chamber, a push rod adjustably connected with said pumping member, and means for actuating said push rod to oprate said pumping member including a driven cam shaft, a cam. on said cam shaft operably associated with said push rod, a drive shaft, means on the drive shaft for driving the cam shaft, a housing supporting the cam shaft and drive shaft, a guide for the push rod fixed to the housing, a spring on the push rod normally urging the same in one direction against the action of said cam, a head on the end of said push rod, a pivoted plate suspended from said housing and interposed between said cam and push rod, a micrometer shaft supported in the housing, and a connection between the micrometer shaft and said swinging plate for adjusting the latter to vary the action of the cam on said push rod.

7. In a pump assembly, a pump chamber including inlet and outlet openings and inlet and outlet valves controlling said openings, 3, pumping member constructed and arranged to operate in said chamber, a push rod adjustably associated with said pumping member for operating the latter, and means for actuating said push rod to operate said pumping member including a driven cam shaft, a cam on said cam shaft operably associated with said push rod, a drive shaft arranged above said cam shaft and at right angles thereto, means on the drive shaft for driving said cam shaft, a housing, bearings for the drive shaft and cam shaft supported by said housing, a guide for the push rod fixed to said housing, a spring on the push rod normally urging the same in one direction against the action of said cam, a conical head on one end of said push rod, a pivoted member suspended from said housing and interposed between said cam and the conical head of said push rod, an axially adjustable rod supported by the housing, and an angular member fixed to one end of said rod and slidably engaging said pivoted member to adjust the latter.

PETER K. SE'I'ER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,117,052 Hotchkiss Nov. 10, 1914 1,576,445 Mitchell Mar. 9, 1926 1,689,636 Milder Oct. 30, 1928 1,736,744 Heine Nov. 19, 1929 1,772,141 Glass Aug. 5, 1930 2,286,928 Pipkin, Jr. June 16, 1942 FOREIGN PATENTS Number Country Date 723,430 France 1932 

